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psbt: Fix PSBTInputSignedAndVerified bounds assert

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The previous `assert` used `>=`, allowing `input_index == psbt.inputs.size()` and out-of-bounds access in `psbt.inputs[input_index]`.

Found during review: https://github.com/bitcoin/bitcoin/pull/31650#discussion_r2685892867

Github-Pull: #34272
Rebased-From: 2f5b1c5f80590ffa6b5a5bcfb21fddb1dc22e852
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Lőrinc 2026-01-13 12:53:51 +01:00 committed by fanquake
parent 22bd00651a
commit 7e1090f5e8
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GPG Key ID: 2EEB9F5CC09526C1
1 changed files with 1 additions and 1 deletions
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src/psbt.cpp
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@ -301,7 +301,7 @@ bool PSBTInputSigned(const PSBTInput& input)
bool PSBTInputSignedAndVerified(const PartiallySignedTransaction psbt, unsigned int input_index, const PrecomputedTransactionData* txdata)
{
CTxOut utxo;
assert(psbt.inputs.size() >= input_index);
assert(input_index < psbt.inputs.size());
const PSBTInput& input = psbt.inputs[input_index];
if (input.non_witness_utxo) {